The title is likely for the Indian Signal Corps. (The official designation for the service corps was Indian Army Service Corps.)The numbers are another question. They may be related to the ISC title, or for something completey unrelated.

So, we're thinking not Canadian? As I picked them up in NB, I was thinking Infantry School Corps (with a Company in Fredericton, before they became The Royal Canadian Regiment) and the 71st Bn. of Infantry (which later became the York Regiment, and then joined the Carleton Light Infantry to become the Carleton and York Regiment).

So these are not of any style of shoulder title worn by Canadian units then?